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Development of the lips and palate. V. VII. IX. X. V1. V2. V3. Dr. Frank C. T. Voon. 13 Apr 2009. Summary. The mandible and lower lip are formed by the fusion of the paired mandibular processes.

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slide1

Development of the lips and palate.

V

VII

IX

X

V1

V2

V3

Dr. Frank C. T. Voon

13 Apr 2009

slide2

Summary

The mandible and lower lip are formed by the fusion of the paired mandibular processes.

The upper lip develops from the intermaxillary segment and from fusion of the maxillary process with the medial nasal process on each side.

The intermaxillary segment gives rise to the philtrum, incisors and the primary palate.

The secondary palate develops from fusion of the palatine shelves of the maxillary process.

slide3

Medial nasal processes

Maxillary processes

Intermaxillary segment

labial component

philtrum

Lip - lateral part

Lip - median part

alveolar component

4 incisors

palatal component

Palatine shelves

primary palate

Concept

Hard palate

Maxilla &

Palatine bone

secondary palate

Definitive palate

Soft palate

muscles

slide4

Derivatives of the Germ Layers

Epithelium

Nerve

Connective tissue

Muscle

Endoderm

Ectoderm

Mesoderm

slide5

The face begins to form in the 4th week.

Brain

3rd

The mesenchyme (mesoderm) of 5 facial primordia from the 1st pharyngeal arch proliferate around the stomodeum.

2nd

1st

Heart

Liver

slide6

The 5 facial primordia are the:

single frontonasal

process,

paired maxillary

processes,

and paired

mandibular processes.

Cardiac bulge

slide7

Medial and lateral nasal swellingsalso form as part of the frontonasal process.

The right and left medial nasal swellings fuse to form the intermaxillary segment.

slide8

The intermaxillary segment develops into 3 parts, the philtrum, the alveolar part (4 incisors) and the primary palate.

The maxillary and medial nasal process on each side fuse to form the rest of the upper lip.

The right and left mandibular processes fuse to form the mandible.

Maxillary process

Mandibular processes

slide9

The palatine shelves of the right and left maxillary processes fuse with the primary palate to form the definitive palate.

Philtrum

4 incisors

Primary palate

Secondary palate

The incisive foramen marks the point of fusion between the two palatine shelves with the intermaxillary segment.

slide10

Cleft lip & palate

Cleft secondary palate

unilateral

bilateral

slide11

In the adult, the definitive palate consists of the hard palate and soft palate as well.

The palatine process of the maxilla and the horizontal plate of the palatine bone are the bones of the hard palate.

The soft palate contains 5 muscles, namely the:

Palatoglossus,

Palatopharyngeus,

Musculusuvulae

Levatorvelipalatini, &

Tensor velipalatini.

Palatoglossus, palatopharyngeus, musculusuvulae and levatorpalati are supplied by the branches of the vagus nerve in the pharyngeal plexus.

Tensor palati is supplied by the mandibular nerve.

slide12

The Palate

The palate consists of the hard palate and soft palate.

The hard palate separates the oral cavity from the nasal cavity.

The softpalate separates the oropharynxfrom the nasopharynx .

The 3 foramina in the hard palate are the:

incisive foramen which transmits the nasopalatine nerve and artery,

greater palatine foramen which transmits the greater palatine n & a.,

lesser palatine foramen which transmits the lesser palatine n & a.

The mucosa of the hard palate is supplied by thenasopalatine and greater palatine nerves.

The mucosa of the soft palate is supplied by the lesser palatine nerves.

These are all branches of the maxillary nerve.

The mucous glands are supplied by parasympathetic fibers from the pterygopalatineganglion.

There are taste fibers in the soft palate which travel with the lesser palatine nerves, pass through the pterygopalatinefossa and pterygoid canal, and then travel with the greater petrosal nerve to join the facial nerve, and their cell bodies are in the geniculate ganglion.